Full three-dimensional measurements of the cross-flow separation region of a 6:1 prolate spheroid

The flow in the cross-flow separation region of a 1.37 m long, 6:1 prolate spheroid at 10° angle of attack was investigated with a novel 3-D fiber-optic Laser Doppler Velocimeter (LDV). The probe was used to measure three simultaneous, orthogonal velocity components from within the model. The design and operation of this LDV probe is described and velocity, Reynolds stress, and velocity triple-product measurements are presented from the inner boundary layer through the boundary-layer edge. Development of the 6:1 prolate spheroid model was funded by the Office of Naval Research, Mr. James A. Fein, program manager. Development of miniature, 3-D, fiber-optic, boundary layer probe and research into the flow around this body was sponsored by the Defense Advanced Research Projects Agency, Mr. Gary W. Jones, program manager.The authors gratefully acknowledge the support of these agencies.